Sweetheart No. 4, 10-5/8 in. Smoothing Bench PlaneThe plane is made for Iron that is 1 8 in. thick. The base is constructed from one piece of Iron. Cherry wood is used to make the handle and knob for comfort. The throat plate adjusts for various types of wood. California residents see Prop 65 WARNINGS Iron is made from extra thick 1 8 in. (3. 18 mm) A2 steel for excellent edge retention One piece base and frog virtually eliminate chatter Cherrywood handle and knob for comfort Norris type adjuster